Fall back to local upload when there is no glance endpoint
Fall back to local upload when there is no glance endpoint

When there is no glance endpoint, it is currently necessary to use
the --local argument when running "openstack overcloud image upload"
to copy the files to /var/lib/ironic/images.

With this change, if there is no glance endpoint then the upload
command will run as if the --local argument is specified.

Change-Id: I264c26f8a63f36cb921c06d1d01db55383394737
Blueprint: nova-less-deploy

openstack/python-tripleoclient